Intramuscular Hematoma

  • Etiology: trauma, post-procedural, anticoagulation
  • US: acutely hypoechoic lesion within muscle, chronically may be septated, isoechoic, or calcified
  • CT: acutely see diffuse isodense enlargement of a muscle which may have areas of high density, chronically appear low density
  • Complications: infection, calcification

Cases of Intramuscular Hematoma

CT of intramuscular hematoma in patient on extracorporeal membrane oxygenation (ECMO)
Axial CT with contrast of the chest shows hematomas in the right sternocleidomastoid muscle (above) near the ECMO catheter insertion site and left pectoralis major muscle.